my skiing activity cant be edited.
Yes, it can. Just change the activity type to cycling or running (top left above the name of the activity), trim it, and then change the type back to skiing…
Click on this icon:
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And this menu will appear:

You're wrong.
You can now trim an activity.
Open an activity, click the gear wheel icon at the right side of the screen and select Trim Activity from the drop down list.
Then adjust the slider(s) and…
Hello there, is there any way to crop activities in Garmin Connect, or is this feature on the roadmap?
Yes.....you can do it......As per instructions above...however it did not work for an 'other' activity. So to get around that, I set the activity type to running, did the 'trim' thing as above, then changed the activity type back to walking. Wasn't the easiest tool to use but it did work (this was on the website on a windows laptop)